package chapter08;

/**
 * Created by V5470-I5 on 2016/3/31.
 */
import java.util.Scanner;
public class Average {
    public static void main(String[] args){
        Scanner console=new Scanner(System.in);
        double sum=0;
        int count=0;
        while (true){
            int number=console.nextInt();
            if(number==0){
                break;
            }
            sum+=number;
            count++;
        }
        System.out.printf("平均%.2f%n",sum/count);
    }
}
